Oh, these were taken with a combination of a pole spear and gaff hooks.
A pole spear is just a long stick with a rubber tubing at one end and a sharp tip (a single tip or three prongs tip called a "paralyzer" tip) at the other.
What you do is place the rubber band in the pocket of your thumb and forefinger and then pull the pole back so that your hand is now holding the pole close to the sharp tip, with the rubber band being very taut. When you want to spear something, you simply point at it and let go of the spear, so the rubber band shoots it forward at high speed.
Same idea as a speargun in a way, but no trigger. Almost like the diff b/t a bow and a crossbow...
Very light, quick, extremely fast to "charge" and to "reload", great all around. But not as powerful, and therefore not as effective on large, powerful fish.
Lots of great sprearfishing on the shipwrecks here in New York...I bagged a 22.5 inch black seabass once (which is a monster), and a 40 inch conger eel later the same day...stalking them and then fighting them underwater was a total rush, especially the eel. I speared it in the gills, and then also stabbed it with a wide, double edged knife, and it still fought me for at least 3 minutes before I could stuff it in the net and close it...